JP5379466B2 - Sliding fit, pipe arrangement and exhaust gas treatment device - Google Patents

Abstract

The sliding fits (15,20) have a wire fabric which supports its outer side at pipes (10,11) in a radial manner and is fixed directly or indirectly at a component. The wire fabric is fixed in a fixture which is fixed at the component. The wire fabric is made of multiple knitted fabric cushions arranged at a distance from each other and distributed in circumferential direction. The wire fabric is made of knitted fabric ring comprises pipes in the circumferential direction. Independent claims are included for the following: (1) a pipe arrangement with two thermally loaded pipes; and (2) a waste gas treatment device, particularly for an exhaust system of an internal combustion engine.

Description

  The present invention relates to a sliding fit for a bearing part which is movable in the axial direction of a pipe, which is subjected to a thermal load, in particular for an exhaust system of an internal combustion engine. The invention also relates to a pipe arrangement in which at least one pipe is mounted on a carrier part with such a sliding fit. The invention further relates to an exhaust gas treatment device comprising such a pipe arrangement or such a sliding fit.

  In order to be able to permanently attach the pipes under thermal load to the carrier, each pipe is connected to a fixed bearing part on the respective carrier and the other to a freely moving bearing part. This is customary and allows the length of the pipe relative to the carrier to be changed without creating an unacceptably high stress between the pipe and the carrier. In order to attach such a freely moving bearing part, a configuration called a sliding fit can be used, in which a pipe is installed in the opening of the receptacle formed in the respective carrier, In particular, the pipe is mounted relative to the carrier so that it can be adjusted in the direction of the longitudinal axis.

  Pipes subjected to thermal loads mounted on carrier parts by sliding fit are used in many technical fields, mainly in the field where hot or cold fluid is transported inside the pipe. For example, this group of problems occurs in heating systems, cooling systems, and exhaust systems. Exhaust systems are found in heating systems and internal combustion engines, particularly vehicles. For example, the exhaust gas treatment device includes at least one pipe mounted within the housing of the exhaust gas treatment device using such a sliding fit. The exhaust gas treatment device may be, for example, a particle filter, a catalytic converter, or a silencer, or a desired combination of such devices.

  Conventional sliding fits have a certain amount of radial play between the pipe and the opening of the respective receptacle to facilitate adjustment of the pipe axis in the fit. Basically, this method is inconvenient for applications that require a certain degree of airtightness because the gas is exchanged through a sliding fit. In particular, in the case of an exhaust system, it is necessary to prevent, for example, exhaust gas from leaking to the surroundings through a sliding fit from the viewpoint of stricter regulations regarding environmental protection.

  Furthermore, in the conventional sliding fit configuration, there is basically a problem of relatively high mechanical loads on the pipes or the respective carrier parts in the sliding fit. Mechanical loads are related to wear and can lead to destructive generation of noise.

  The present invention relates to the particular problem of an improved embodiment for a slip fit, pipe arrangement, or exhaust gas treatment device, which basically provides some degree of sealing effect, And / or is particularly distinguished by the fact that the mechanical load inside the sliding fit is reduced.

  This problem is solved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject of the dependent claims.

  The invention is based on the general idea of providing a wire mesh for each sliding fit, which is permanently attached to each part on the one hand, directly or indirectly, and on the other hand, radially supported outside the pipe. Is based. If the length changes due to thermal load during operation, the pipe can slide along the wire mesh. Such a wire mesh has a repulsive force due to a certain amount of spring elasticity, thus reducing the mechanical load on the pipe or component inside the sliding fit. At the same time, the relative radial movement between the pipe and the part, for example due to vibration during operation, can be repelled or damped. Therefore, the associated noise can be effectively reduced.

  Further important features and advantages of the invention will become apparent from the dependent claims, the drawings and the associated drawing description with reference to the drawings.

  Of course, the features mentioned above and described below can be used not only in the respective specific combinations, but also in other combinations or individually without departing from the scope of the invention. .

  According to the present invention, an improved embodiment can be provided for a slip fit, pipe arrangement, or exhaust gas treatment device, which basically provides some degree of sealing effect. It is particularly distinguished by the fact that it is realized and / or the mechanical load inside the sliding fit is reduced.

  Preferred exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein like reference numerals are used to designate like or similar or functionally similar elements.

  The drawings are respectively schematic views, FIG. 1 is a highly simplified longitudinal sectional view of an exhaust gas treatment device, and FIG. 2 is a detailed enlarged view of a pipe arrangement region of the exhaust gas treatment device. 3 to 7 are highly simplified enlarged views of different embodiments of sliding fit portion pipe arrangements, and FIGS. 8 and 9 are different embodiments of FIG. It is longitudinal direction sectional drawing.

  According to FIG. 1, the exhaust gas treatment device 1 includes a housing 2 and at least one pipe arrangement 3. The housing 2 has at least one intake port 4 and at least one exhaust port 5. In the embodiment shown here, the housing 2 has two end plates 6, 7 and one intermediate plate 8. The first end plate 6, together with the intermediate plate 8, partitions the inlet chamber 9 in the housing 2. The air inlet 4 is connected to the first end plate 6 in the form of an air inlet connector.

  The pipe arrangement 3 includes at least two pipes in communication with each other, that is, a first pipe 10 and a second pipe 11. The first pipe 10 communicates with the intake port chamber 9 on the intake port side, and communicates with the deflection chamber 12 on the exhaust port side. The first pipe 10 is attached at the inlet 13 to the carrier part which is formed here by the housing 2 or in particular by the part of the housing 2 which here is the intermediate plate 8. At the exhaust port 14, the first pipe 10 is also fixed to the housing 2, which is a carrier part, in particular a second end plate 7, with a sliding fit 15. The second pipe 11 communicates with the deflection chamber 12 on the intake port side, and communicates with a chamber 16 that functions as a further deflection chamber or a distribution chamber on the exhaust port side. The intake port 17 of the second pipe 11 communicates with the exhaust port 18 of the first pipe 10 via the deflection chamber 12. Since the deflection chamber 12 connects the two pipes 10 and 11 to each other in a communicating manner, the deflection chamber 12 may be referred to as a connection chamber 12 below. In the air inlet 19, the second pipe 11 is fixed to the housing 2, which is a carrier part, in particular, the second end plate 17, with a sliding fit 20. Furthermore, at the exhaust port 21, the second pipe 11 is also connected to the carrier component, ie the housing 2. In the case of this embodiment, the housing 2 includes a shell 22 to which the second pipe 11 is attached at its exhaust port 21 to form the chamber 16.

  The first pipe 10 has a first longitudinal central axis 23. The second pipe 11 has a corresponding second longitudinal central axis 24. In the embodiment shown here, the two longitudinal central axes 23, 24 extend parallel to each other. Both pipes 10, 11 pass through the respective plates 7 with separate openings.

  In the embodiment shown here, the exhaust port 18 of the first pipe 10 and the intake port 17 of the second pipe 11 enter the connection chamber 12 with each open. Here, the connection chamber 12 is formed by one or more contours 25 constructed in the exhaust port portion 14 of the first pipe 10 and the intake port portion 19 of the second pipe 11. As an alternative, an embodiment in which the contour 25 is constructed on the second end plate 7 is also possible. Similarly, an embodiment is possible in which a bent connection pipe is used instead of a connection chamber to connect the two pipes 10, 11 to each other. Such a connection pipe connects the exhaust port 18 of the first pipe 10 to the intake port 17 of the second pipe 11.

  The embodiment shown here relates to an exhaust gas treatment device 1 that can be used in an exhaust system of an internal combustion engine, which in particular can be arranged in a powered vehicle, preferably a utility vehicle. The exhaust gas treatment device 1 has a multi-functional configuration here, and includes at least one particle filter element 26 configured in the first pipe 1. Here, the exhaust gas treatment device 1 further comprises at least one oxidation catalytic converter element 27 arranged in the first pipe 10 upstream of the particle filter element 26 for the sake of convenience. Further, the exhaust gas treatment device 1 can provide a silencing effect.

  Here, the first pipe 10 has a radially removable shaft 28, here shown in long brackets. Such a shaft 28 is attached to the other part of the first pipe 10 by means of a mounting element 41 which can be removed quickly, for example in the form of a clamp. For this purpose, a corresponding flange can be formed which interacts with the mounting element 41. The particle filter element 26 is configured for convenience in a shaft portion 28 that is removable in the radial direction. In this way, each particle filter element 26 is easily updated or replaced, for example. In this way, all the units are constituted by the shaft portion 28, and the particle filter element 26 inserted therein is exchanged for convenience.

  In this example, a third pipe 29 is also provided, whose longitudinal central axis 30 can also be arranged parallel to the longitudinal central axes 23, 24 of the other two pipes 10, 11. The exhaust port 31 of the third pipe 29 communicates with the exhaust port 32 of the second pipe 11. In this example, the second pipe 11 and the third pipe 29 enter the chamber 16, thereby forming a connection in communication between the two pipes 11, 29. The third pipe 29 may include at least one SCR catalytic converter 33. In this example, three such catalytic converter elements 33 are arranged in series within the third pipe 29. By using such an SCR catalytic converter 33, it is possible to realize selective catalytic reduction of specific pollutants.

  In this example, the exhaust gas treatment device 1 also has a metering device 34 that can be used to supply a liquid extract to the exhaust gas stream. This metering device 34 can be used for convenience in order to introduce ammonia or urea or preferably an aqueous urea solution into the exhaust gas stream. Urea can be converted to ammonia by a hydrolysis reaction. Ammonia is used to convert nitrous oxide to nitrogen. A corresponding reaction occurs in the SCR catalytic converter 33.

  In any case, the metering device 34 can be configured or assembled so that the respective extract is fed into the exhaust gas stream upstream of the SCR catalytic converter 33. The injection is performed downstream of the particle filter 26 for convenience. This injection can basically take place in the deflection chamber 12. The metering device 34 preferably supplies the extract to the inlet 19 of the second pipe. However, the injection of the extract can also occur upstream of the second pipe 11. In order to carry out intensive mixing of the exhaust gas and the extract, the second pipe 11 can here function as a mixing part for the exhaust gas and the supplied extract.

  In the example shown here, the exhaust gas processing apparatus also includes a fourth pipe 35 connected to the exhaust port 5 or connected to the exhaust port 5 configured as an exhaust port connector. The intake port 36 of the fourth pipe 35 is connected to the exhaust port 37 of the third pipe 29 in a communicating manner. Here, this is achieved by means of a further deflection chamber 38, which is realized using the shell 39 and the second end plate 7. In this case, the longitudinal central axis 40 of the fourth pipe 35 extends parallel to the longitudinal central axes 23, 24 of the first pipe 10 or the second pipe 11.

  The cross-sectional view of the exhaust gas treatment device 1 shown here shows in each case a single first pipe 10, a single second pipe 11, a single third pipe 29, a single Only the fourth pipe 35 is seen. Obviously, in a specific example, a plurality of at least one of the pipes 10, 11, 29, 35 may exist. For example, a plurality of second pipes 11 and / or a plurality of third pipes 29 may be provided in the SCR catalytic converter 33.

  According to FIG. 2, the sliding fit 15 has a wire mesh 42 by which the first pipe 10 is mounted on the carrier part 2 or the housing 2. The wire mesh 42 is configured to be fixed to the component 2, that is, to the housing 2, and is supported radially outside the first pipe 10. Accordingly, the pipe 10 can move in the axial direction along the wire mesh 42. The wire mesh 42 itself is fixed to the housing 2 directly or indirectly.

  In addition or alternatively, the sliding fit 20, on which the second pipe 11 is mounted on the carrier part 2 or on the housing 2, on the one hand, radially outside the second pipe 11. It has a wire mesh 42 that is supported and supported directly or indirectly on the part 2 or on the housing 2.

  The wire mesh that may be used to hold the catalytic converter element within the catalytic converter housing may be essentially a wire mesh 42. Such a wire mesh 42 is distinguished by having a relatively high resistance to temperature and a certain degree of spring elasticity. By using the wire mesh 42, each sliding fit 15 or 20 can radially secure the respective pipe 10, 11 and nevertheless the pipe 10, 11 and the housing 2 or second. The relative movement in the axial direction between the end plates 7 is enabled.

  The wire mesh 42 can basically be composed of a plurality of wire mesh pillows distributed in the circumferential direction and arranged at intervals. Here, the wire mesh 42 is formed by a plurality of parts, that is, a plurality of separated wire mesh pillows. However, if a certain degree of airtightness is important in the sliding fit 15 or 20, respectively, so as to be constituted at least by mesh rings surrounding each pipe 10, 11 in a circumferentially closed annular shape. The wire mesh 42 is preferably formed. In the embodiments shown in FIGS. 2-7, in each case only a single mesh pillow or a single mesh ring is seen. When there are a plurality of mesh rings, they are configured adjacent to each other in the axial direction for convenience.

  In the embodiment shown in FIGS. 3 and 4, each sliding fit 15, 20 is additionally provided with a fastener 43, which is attached to the respective part 2, here the housing 2 or its bottom plate 7. Yes. The fastener 43 functions to fix the wire mesh 42 to the component 2, that is, the housing 2. The fastener 43 is formed in an annular shape, for example, and can extend around the pipes 10 and 11 in the circumferential direction. In the embodiment of FIGS. 3 and 4, the fasteners 43 are distinguished by a U-shape forming an annular groove that opens radially inward and into which the wire mesh 42 is inserted.

  In the embodiment shown in FIG. 5, the fastener 43 ′ is pre-integrated with the part 2 or housing 2, and the bottom plate 7 in the edge region of the opening through which the respective pipe 10, 11 is inserted into the bottom plate 7. Are specifically configured here (not described in detail above).

  In the embodiment shown in FIGS. 6 and 7, the fastener is formed by forming a receptacle with a cover 44 and forming the part 2 in the area of the sliding fit 15, 20 to form the fastener 43 ″. 43 ″ is formed.

  In the embodiment shown in FIGS. 3 and 4, the wire mesh 42 has a rectangular or elliptical cross section. In the embodiment shown in FIGS. 5-7, the wire mesh 42 has a circular cross section. In the embodiment shown in FIGS. 3 and 7, the radial support acting in addition to the wire mesh 42 and operating in the formation of contact between the fasteners 43, 43 ″ and the pipes 10, 11 is clamped. It can be realized in the sliding fit 15, 20 by means of tools 43 or 43 ". In contrast, in the embodiment of FIGS. 4-6, radial support within the sliding fits 15, 20 occurs exclusively via the wire mesh 42.

  The embodiment according to FIG. 8 differs from the embodiment according to FIG. 1 only in that the deflection chamber 12 here extends over the entire height or all sides of the second end plate 7 or the exhaust gas treatment device 1. . This makes it possible to reduce the counter pressure. For this purpose, a contoured lid 45 is integrally formed on the second end plate 7, so that the deflection chamber 12 is surrounded or tied together by the second end plate 7 and the lid 45. In contrast to this, in the embodiment according to FIG. 1, the enclosure 25 forms a separate part from the second end plate 7 with the deflection chamber 12 surrounded or bound by it.

  In the embodiment according to FIG. 9, both a contour 25, which is separate from the second end plate 7 and intended to form the deflection chamber 12, and a lid 45 which extends over the entire second end plate 7 and is attached thereto. Is provided. As a result, the deflection chamber 12 is doubly surrounded inside the exhaust gas treatment device 1, in particular, by the outline 25 and the lid 45. The inside of the outline 25 is separated from the inside of the lid 45 in an airtight manner. As a result, the lid 45 and the second end plate 7 can form a space or chamber 38 that deflects the exhaust gas from the third pipe 29 to the fourth pipe 35. In this design, the other enclosure 39 that forms or surrounds the entire deflection space 38 in the embodiment of FIGS. 1 and 8 can be omitted.

FIG. 2 is a longitudinal cross-sectional view of an exhaust gas treatment device that is highly simplified. FIG. 3 is a detailed enlarged view of a pipe arrangement region of the exhaust gas treatment device. FIG. 6 is a highly simplified enlarged view of the pipe arrangement of the sliding fit portion of different embodiments. FIG. 6 is a highly simplified enlarged view of the pipe arrangement of the sliding fit portion of different embodiments. FIG. 6 is a highly simplified enlarged view of the pipe arrangement of the sliding fit portion of different embodiments. FIG. 6 is a highly simplified enlarged view of the pipe arrangement of the sliding fit portion of different embodiments. FIG. 6 is a highly simplified enlarged view of the pipe arrangement of the sliding fit portion of different embodiments. FIG. 2 is a longitudinal sectional view of an embodiment different from FIG. 1. FIG. 2 is a longitudinal sectional view of an embodiment different from FIG. 1.

DESCRIPTION OF SYMBOLS 1 Exhaust gas processing apparatus 2 Housing 3 Pipe arrangement | positioning 4 Intake port 5 Exhaust port 6, 7 End plate 8 Intermediate | middle plate 9 Intake port chamber 10 1st pipe 11 2nd pipe 12 Connection chamber 13 Intake port part 14 Exhaust port part 15 Sliding fit 16 Chamber 17 Intake port 18 Exhaust port 19 Inlet port 20 Slip fit 21 Exhaust port 22 Enclosure 23 First longitudinal center axis 24 Second longitudinal center axis 25 Enclosure 26 Particle filter element 27 Oxidation catalytic converter element 28 Radially removable shaft part 29 Third pipe 30 Longitudinal central axis 31 Exhaust port 32 Exhaust port 33 SCR catalytic converter 34 Metering device 35 Fourth pipe 36 Inlet port 37 Exhaust port 38 Deflection chamber 39 Outline 40 Longitudinal axis 41 Attachment element 42 Wire mesh 43 Tool 43 'the clamp 43 "the clamp 44 cover 45 lid

Claims (10)

An exhaust gas treatment device,
A housing (2) having at least one inlet (4) and at least one exhaust (5);
A pipe arrangement (3) having at least two pipes (10, 11) in communication with each other;
A first pipe (10) is attached to the housing (2) at an inlet (13);
The first pipe (10) is fixed to the housing (2) by a sliding fit (15) at the exhaust port (14);
If the second pipe (11) connected to the inlet (17) of the first pipe (10) slides on the housing (2) at the inlet (19). (20),
The second pipe (11) is fixed to the housing (2) at an exhaust port (21);
At least one of the sliding fit configurations (15, 20) is a sliding fit for an axially movable bearing portion of the pipe (10, 11) that is subjected to a thermal load, wherein Having a wire mesh (42) supported radially on the outside of the pipe (10, 11) and fixed directly or indirectly to the housing (2);
The wire mesh (42) is fixed in a fastener (43) attached to the housing (2);
The wire mesh (42) is composed of a plurality of wire mesh pillows separated from each other in the circumferential direction, or the wire mesh (42) is annularly arranged in the circumferential direction in the pipes (10, 11). And at least one mesh ring that surrounds
Said first pipe (10) comprises at least one particle filter element (26);
The first pipe (10) comprises at least one oxidation catalytic converter element (27);
Said first pipe (10) has a radially removable shaft (28);
The radially removable shaft (28) includes at least one of the particle filter elements (26);
Exhaust gas treatment device. A third pipe (29) is provided, the inlet (31) of which is connected to the exhaust port (32) of the second pipe (11).
The exhaust gas treatment device according to claim 1. The third pipe (29) comprises at least one SCR catalytic converter (33);
The exhaust gas treatment device according to claim 2. A metering device (34) is provided for supplying the fluid extract;
The exhaust-gas processing apparatus as described in any one of Claims 1-3. The second pipe (11) functions as a mixing part of the exhaust gas and the liquid extract;
The exhaust gas treatment device according to claim 4. The metering device (34) supplies the liquid extract at the inlet (19) of the second pipe (11);
The exhaust gas processing apparatus according to claim 4 or 5. The exhaust pipe (37) of the third pipe (29) is provided with a fourth pipe (35) connected to the intake opening (36).
The exhaust gas treatment device according to claim 2. The fourth pipe (35) passes through the exhaust port (5);
The exhaust gas treatment device according to claim 7.   The exhaust gas according to any one of the preceding claims, wherein longitudinal central axes (23, 24) of the first pipe (10) and the second pipe (11) extend parallel to each other. Processing equipment. A bent connection pipe is provided which connects the exhaust port (18) of the first pipe (10) to the intake port (17) of the second pipe (11); or
1. A connection chamber (12) is provided in which the exhaust port (18) of the first pipe (10) and the intake port (17) of the second pipe (11) are opened. The exhaust gas treatment device according to any one of claims 9 to 10.

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